Building a Smart IoT Greenhouse with ESP32

The Problem

Traditional greenhouses require constant manual monitoring. Temperature, humidity, and soil moisture need to be checked multiple times a day. This is inefficient and error-prone.

The Solution

I built a fully automated greenhouse monitoring system using:

Architecture

The system follows a simple but effective architecture:

Sensors → ESP32 → WiFi → Firebase → Android App

Each sensor reads data every 30 seconds. The ESP32 aggregates the readings and pushes them to Firebase. The Android app displays real-time data with charts and alerts.

Key Code Snippet

Here's how I initialized the sensor array on the ESP32:

#include <DHT.h>
#include <BH1750.h>

DHT dht(4, DHT22);
BH1750 lightMeter;

void setup() {
  Serial.begin(115200);
  dht.begin();
  lightMeter.begin();
}

Results

The system reduced manual monitoring time by 90% and improved crop yield by 25% through optimal condition maintenance.

What I Learned